
Previously, the client of PopupMenuButton needed to build all the menu times when building the PopupMenuButton. This can get expensive if, for example, each item in a scrollable list has a popup menu associated with it. Now the client passes a builder function to the PopupMenuButton that gets invoked only when its time to show the menu items.
Flutter Examples
This directory contains several examples of using Flutter. Each of these is an individual Dart application package.
To run a sample with the flutter
tool, run pub get
inside its directory,
then run flutter run
. (See the
getting started guide to install
the flutter
tool.)
Available examples include:
-
Hello, world The hello world app is a basic app that shows the text "hello, world."
-
Stocks The stocks app is an example of a typical mobile app built using Flutter. The app shows a list of all the stocks in the NASDAQ.
-
Widgets The widget apps demonstrate a number of Flutter widgets so you can experiment with them in a simple container. There is no main.dart in this directory because each file is a standalone sample. To run a particular file, use
flutter run -t filename.dart
.